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Carbon Storage in Coarse and Fine Fractions of Pacific Northwest Old-Growth Forest Soils

^a Dep. of Environmental Sciences, Huxley College of the Environment, Western Washington University, Bellingham WA, 98225-9181
^b USDA Forest Service Pacific Northwest Research Station, Corvallis OR, 97331
^c Department of Forest Science, Oregon State University, Corvallis OR, 97331

View larger version (36K): [in a new window]   Fig. 1. Forest floor C pools of old-growth forests of the Pacific Northwest. Each bar represents a forest and is the average of 1 to 8 pedons (see Table 2). Pooled within-forest coefficient of variation (CV) is 77%. With n = 4 pedons per forest, a ratio of a higher mean to a lower mean >2.8 indicates two forests are significantly different, based on ANOVA of log-transformed values followed by the LSD test ( = 0.05); exact cutoff value of ratios differs among pairs of forests because of different numbers of pedons at different forests.

View larger version (37K): [in a new window]   Fig. 2. Whole mineral-soil C pools of old-growth forests of the Pacific Northwest. Each bar represents a forest and is the average of 1 to 8 pedons (see Table 2). Pooled within-forest CV is 34%. With n = 4 pedons per forest, a ratio of a higher mean to a lower mean >1.5 indicates two forests are significantly different, based on ANOVA of log-transformed values followed by the LSD test ( = 0.05); exact cut-off values of ratios differ among pairs of forests because of different numbers of pedons at different forests.

View larger version (64K): [in a new window]   Fig. 3. Proportion of whole mineral-soil C in size fractions of Pacific Northwest old-growth forests. Only forest provinces with C in >2-mm fractions are shown. Each bar represents 1 to 8 pedons within a forest (see Table 2). Pooled within-cell (forest–depth combination) CV of <2-mm proportion is 15%.

View larger version (55K): [in a new window]   Fig. 4. Proportion of <4-mm C in size fractions of Pacific Northwest old-growth forest soils, as affected two different treatments: periodic swirling with sodium hexametaphosphate for 12 h, or constant shaking with sodium hexametaphosphate for 12 h. Each value is based on five soil samples that have C in both the <2 and 2- to 4-mm fractions. The LSD bars are based on randomized block ANOVA (soil is block) for each province, followed by LSD test ( = 0.05).